It's one of the most-searched renovation questions in Ontario: do I actually need a structural engineer for this? The honest answer is "for less than you fear, but more than you'd guess." Here's a plain-language guide to when engineering is required, when it's smart, and when you can skip it.
When it's required
Ontario municipalities require sealed engineering for structural work as part of the building permit process. In practice that includes: removing or altering a load-bearing wall, additions and second storeys, basement underpinning or bench footings, new beams and columns, decks beyond simple prescriptive sizes, foundation work of any kind, and second units where structure changes. If a building official asks for "sealed drawings" or "a stamped letter," that's an engineer.
When it's not required — but smart
Pre-purchase reviews of older homes, assessment of cracks or sloping floors, and verifying a contractor's proposal before you sign are all optional — and routinely save multiples of their cost. A one-hour site visit that redirects a renovation plan is the cheapest change order you'll ever pay for.
When you likely don't need one
Cosmetic renovations, kitchens and bathrooms that don't touch structure, flooring, and most non-bearing partition changes generally don't need engineering. If you're unsure whether a wall is bearing — that's exactly the question a quick assessment answers.
Rule of thumb: if the work changes how loads travel through your house, an engineer is involved. If it changes how the house looks, probably not.
What it costs and how fast it moves
Residential engineering is more affordable than most homeowners expect — typically a small, fixed fee known up front rather than a percentage of construction. Our practice provides same-day quotes, and permit drawings within 5 business days for the majority of residential projects, so engineering is rarely the critical path on your renovation.
Not sure which category your project falls in? Describe it in a couple of sentences and send a photo — we'll tell you straight, and quote it the same day if you need us.